Acceleration statistics of finite-sized particles in turbulent flow: the role of Faxen forces

Details Acceleration statistics of finite-sized particles in turbulent flow: the role of Faxen forces Acceleration statistics of finite-sized particles in turbulent flow: the role of Faxen forces

2008-11-26

arxiv.org/abs/0811.4410v2

J. Fluid Mech. 630, pp. 179 - 189 (2009)

Physics

Fluid Dynamics

10 pages, 4 figures

Scientific paper

The dynamics of particles in turbulence when the particle-size is larger than the dissipative scale of the carrier flow is studied. Recent experiments have highlighted signatures of particles finiteness on their statistical properties, namely a decrease of their acceleration variance, an increase of correlation times -at increasing the particles size- and an independence of the probability density function of the acceleration once normalized to their variance. These effects are not captured by point particle models. By means of a detailed comparison between numerical simulations and experimental data, we show that a more accurate model is obtained once Faxen corrections are included.

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